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1821

Centuries: 18th century - 19th century - 20th century

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Years: 1816 1817 1818 1819 1820 - 1821 - 1822 1823 1824 1825 1826


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Quadratic formula

... b/(2a)). The right side can be written as a single fraction; the common denominator is 4a2. W ...

 
 
 
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